JPH0675914B2 - Blow Mold Label Supply Device in Mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention relates to a blow molding die for in-mold labeling in which a surface of a blow molding product made of a synthetic resin is labeled at the same time as molding in the blow molding die. Label supply device

(Prior Art) An apparatus for supplying a label into a blow molding die for in-mold labeling is disclosed in Japanese Patent Publication No. 47-43622 and Japanese Utility Model Publication No. 47.
-32823 and so on.

In these conventional techniques, although the label supply means into the mold by the label supply head in the mold is different, the method of taking out the label from the label holder is
A structure is shown in which the label in the label holder opening is directly adsorbed on the label adsorbing surface of the in-mold supply head, and is pulled out by an air cylinder in a direction perpendicular to the label surface.

The plurality of labels stored in the label holder are pushed toward the front opening by the force of a spring or the like, and there are a plurality of hooks around the opening to prevent the labels from popping out. It is provided (Actual Kosho 47-32823
No.).

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional technique, when the label is taken out from the label holder opening, the label is directly adsorbed by the adsorption surface of the label supply head and is perpendicular to the label surface. Because it is pulled out, when pulling out the frontmost label, a suction force due to negative pressure is generated between the next label and the next label, and the labels stick to each other and are pulled out at the same time. There's a problem.

That is, a hook is provided around the opening of the label holder so as to prevent the label from jumping out, and the labels are overlapped with each other in a state of being in close contact with each other.

Nevertheless, if you try to pull out the foremost label in the direction perpendicular to the label surface with the suction surface of the label supply head, outside air will enter from the outer peripheral edge of the label between the frontmost label and the subsequent labels. As a result, a negative pressure is generated between the labels, so a suction force is exerted.If you pull out the label vertically with respect to the label surface while this suction force is generated, you cannot pull out multiple labels at the same time. Occur.

As a result of simultaneous withdrawal of a plurality of labels, problems such as sticking of two sheets, which are defective molding products, and extra labels dropped and lost during transfer to the mold occur. Moreover, the frequency of occurrence of these problems increases as the thickness of the label decreases and the rigidity decreases and the label easily deforms.

The present invention has been made by focusing on the above-mentioned problems, and in a blow molding die label supply device for in-mold labeling for performing labeling at the same time as blow molding, surely into the blow molding die. An object of the present invention is to provide a device that supplies labels one by one and does not generate label loss or defective products (two pieces are stuck).

(Means for Solving the Problems) In order to solve the above problems, in the blow mold in-mold label supply device of the present invention, the label in the label holder is directly attracted to the in-mold supply head and is perpendicular to the label surface. Instead of pulling it out to the end, it was taken out as a means to pull it out from the label end by a label pick-up suction disk that rotates in synchronization with the label holder.

That is, the label is taken out from the label holder and is supplied to the inner surface of the cavity of the blow molding die, and the label is attached to the surface of the synthetic resin molded product at the same time as the blow molding. It is possible to move forward and backward with the label holder, and after advancing between the blow molds in the open state at the time of advancing, the label suction part is moved forward toward the inner surface of the cavity of the blow mold. A label supply head in a mold for supplying a label to an inner surface of a cavity, wherein a label take-out suction plate is provided between the label feed head in the mold and the label holder. The label holder and the label holder can rotate at the same peripheral speed, and both are rotated so that the suction surface of the label pickup suction plate is A position where the label is adsorbed when it comes into contact with the outermost label surface in the label holder, and the label adsorbed when the adsorption surface is separated from the label holder due to the rotation of both is taken out from the label holder. The label suction part of the in-mold label supply head is arranged in a positional relationship such that the label suction part of the in-mold label supply head can come into contact with the suction surface of the label pickup suction plate at a position different from the label holder. Characterize.

(Operation) When the labels are supplied one by one into the mold cavity by using the blow-mold in-mold label supply device for in-mold labeling of the present invention constituted by the above means, first, the label holder and the label take-out suction The disc rotates synchronously with the disc at the same peripheral speed, and the label in the label holder opening is adsorbed to the facing label pick-up adsorption disc from the direction of rotation, and the label adsorption area on the adsorption disc increases as the rotation progresses. , The label is sucked and transferred to the suction plate so that the label is flipped and taken out.

In this way, since the label is taken out from the label holder from the label holder by flipping it by the suction cup, outside air easily enters between the label in contact with the suction cup and the next label, and suction by negative pressure is performed. The force is not generated, and the labels are surely sucked out one by one from the label holder by the suction plate.

Then, when the suction transfer of the label to the suction cup is completed, the synchronous rotation of the label holder and the suction cup is stopped, and then the label suction section of the label supply head in the mold sucks the label from the suction cup and receives it. It is transferred from the suction part to the inner surface of the blow molding die and is sucked, and the label is surely applied to the surface of the molded product at the same time as the blow molding.

(Examples) Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing a label supply device in a blow molding die of an embodiment of the present invention when labels are attached to both sides of a molded product.

Reference numeral 1 in FIG. 1 denotes a label holder. A large number of labels A are stored in the label holder 1, one end of which is opened, and a peripheral edge of the opening is used to hold the peripheral edge of the label. The claws 12 are provided at several places, and a pressing tool 13 is provided for pressing the label A in the opening direction with a force that does not cause the label A in the label holder 1 to fall off under the pressure of a pressing means such as a spring. ing.

Further, the label holder 1 can be freely rotated by a support shaft 14 provided on the center line behind the lower surface thereof.

Reference numeral 2 in FIG. 1 is a label take-out suction plate for turning the labels one by one from the label holder 1 and taking them out, which has an arc-shaped suction surface 21, and suction holes 22 are radially formed in the suction surface 21. It has a plurality of openings and is connected to an intake air supply source (for example, a vacuum pump).

In addition, a suction surface 21 is provided on the lower surface of the label pickup suction board 2.
A support shaft 23 located at the center of the arc of
Is directly connected to a driving unit that reciprocates left and right, such as a rotary actuator that operates by air pressure, and a gear 25 having the support shaft 23 as a center is attached to the support shaft 23.

On the other hand, a fan-shaped gear 15 that presses the support shaft 14 as a center is also provided on the lower surface of the label holder 1 and a gear 25 of the label pickup suction plate 2.
It is attached so as to mesh with.

The label holder 1 and the label take-out suction cup 2 are centered on the respective spindles 14 and 23 while the label surface at the opening end of the label holder 1 and the suction face 21 of the label take-out suction cup 2 face-to-face contact with each other. Are paired with each other and are arranged so as to rotate in synchronization with each other.

Reference numeral 3 in FIG. 1 denotes an in-mold label supply head for supplying a label into the blow molding mold, which is attached to a drive unit such as the air cylinder 4 and further has guide shafts 5 provided on both sides.
Slide back and forth along 5 '.

In addition, the in-mold label supply head 3 has an air cylinder 31
Adsorption heads 32, 32 that open and close (extend or retract or move forward and backward) are provided to the left and right respectively by driving means such as, and the suction surface 33 of each suction head 32 has a plurality of suction holes 34 open vertically. is doing. When the in-mold label supply head 3 is located rearward, the suction head
When 32 and 32 are opened (each suction head 32 moves forward), the suction head 32 comes into contact with the suction surface 21 of the label pickup suction plate 2 in a stopped state after label suction, and when the suction head 32 is located in the front. And the suction holes 6 on the inner surface of the cavity of the blow molding dies 6, 6'where the respective suction surfaces 33 are divided into two and opened to the left and right.
1 is placed so as to come into contact with the label attachment surface where multiple openings are made.

If it is necessary to supply labels to the inner surfaces of both cavities of the blow molding dies 6 and 6 ′ that are divided into two parts (that is, if it is necessary to attach the labels to both sides of the blow molded product), As shown in FIG. 1, two sets of a label holder 1 and a label take-out suction plate 2 are provided at positions facing each other with the in-mold label supply head 3 interposed therebetween, and the in-mold label supply head 3 is sucked by a suction head 32. If two labels are provided and it is sufficient to supply the label to the inner surface of one of the cavities of the blow molding dies 6 and 6 '(that is, if the label is attached to only one side of the blow molded product), the label One set of the holder 1 and the label take-out suction plate 2 may be provided on one side of the label supply head 3 in the mold.
One 32 may be provided on the same side.

Next, the operation (movement) of the embodiment will be described.

In the above-mentioned in-mold label supply device, the movements of the respective parts are linked as follows by sequence control.

2 to 4 show a state in which the label is transferred from the label holder 1 to the label supply head 3 in the mold via the label pickup / sucker 2 and sucked by the label. Also, the fifth
FIG. 6 shows a state in which the label A is supplied into the blow molding die 6.

First, when the device switch is turned on, the drive unit of the rotary actuator is activated, and the label holder 1 and the label take-out suction cup 2 start to rotate relatively slowly in synchronization from the state shown in FIG. Vacuum is applied to the suction holes 22 of the label holder 1, and the label at the opening end of the label holder 1 starts to be sucked from a plurality of suction holes 22 radially provided on the suction surface 21 in face-to-face contact, and further rotates. , The suction to the suction hole 22 adjacent to the suction surface 21 also starts, and as shown in FIG.
Are picked up from the end on the side of the rotation advancing direction, and sucked and transferred to the label pick-up and sucking plate 2.

When the suction transfer is completed and the sucked label A reaches a position facing the suction surface 33 of the suction head 32 of the in-mold label supply head 3, the rotation is stopped by a stopper (not shown).

Simultaneously with this stop, the suction heads 32, 32 move forward toward the label take-out suction cup 2 and open a constant stroke while the vacuum is working in the suction holes 34 of the suction heads 32, 32,
As shown in the figure, the suction hole 34 comes into contact with the surface of the label A sucked and transferred to the label take-out suction plate 2.

After that, the vacuum of the suction hole 22 of the label take-out suction plate 2 is stopped, and instead compressed air is jetted for a short time, whereby the label A is completely transferred and sucked to the suction head 32.

Then, when transfer adsorption is completed, as shown in FIG.
In order to maintain the suction of the label A, the suction heads 32, 32 are closed by retreating in the direction away from the label taking-out suction plate 2 while keeping the vacuum in the suction hole 34.

Next, when the label holder 1 and the label take-out suction disk 2 are rotated in the opposite directions and returned to their original positions, the in-mold label supply head 3 starts to move forward by the air cylinder 4, and as shown in FIG. Blow molding dies open to the left and right 6,6 '
When it reaches the labeling position in the cavity of, it is stopped by a stopper (not shown).

Then, as shown in FIG. 6, the suction head 32 is opened (advanced or extended), and the label A is pressed against the inner surface of the cavity. At this time, the vacuum has been preliminarily applied to the suction holes 61 that are open at a plurality of locations on the inner surface of the cavity, and after the label A is pressed, the vacuum of the suction head 32 is cut off and the label A is placed at a predetermined position on the inner surface of the cavity. After the suction has been sucked, the suction head 32 is closed (retracted or contracted), and the in-mold label supply head 3 retracts and returns to the original position.

With the above operation, the label supply into the mold is completed.

In this way, the label A adsorbed on the inner surface of the cavity
Is attached to the surface of the molded product by the heat of the molded product simultaneously with the blow molding in the next blow molding process.

Then, this molding process is completed, and then the blow mold 6,
By the time 6'opens to the left and right, the work until the label A is sucked and transferred from the previous label holder 1 through the label pickup suction plate 2 to the label supply head 3 inside the mold, and the next mold Waiting for supply to

As described above, the blow mold label supplying apparatus of the embodiment has the features listed below.

Unlike the conventional apparatus, the apparatus of the embodiment does not directly suck the label in the label holder 1 to the in-mold label supply head 3 to extract it in the direction perpendicular to the label surface, but once rotates in synchronization with the label holder 1. Since the device for taking out the label from the end of the label A by the label take-out suction cup 2 is used, a suction force due to a negative pressure is not generated between the label and the next label, and the label A is surely taken out from the label holder 1 one by one. be able to.

As a result, the frequency of occurrence of defects such as sticking two sheets, which are defective molding products, and dropping the excessively extracted label, which causes label loss, during transfer to the mold was significantly reduced.

In particular, for thin labels, the frequency of occurrence of defects was significantly reduced.

The label suction surface 33 of the in-mold label supply head 3 comes into contact with the suction surface 21 of the label pick-up and suction board 2 when the label suction head 32 is in the forward position, so that the in-mold label supply head 3 Can be easily arranged so as not to come into contact with the label pickup suction plate 2 when moving forward and backward.

As a result, it is not necessary to use the device for moving the label pick-up and suction board 2 away from the label supply head 3 in the mold, and the degree of freedom in layout, downsizing of the device, and cost advantage can be obtained.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within the scope not departing from the gist of the present invention, it is included in the present invention. Be done.

For example, in the embodiment, if the label suction by the suction plate 22 and the suction holes 22 and 34 of the label feeding head 3 in the mold is poor, the pad made of a flexible material such as rubber is sucked. The adsorption performance can be improved by filling the holes 22 and 34 and exposing the tip slightly from the adsorption surface.

(Effects of the Invention) As described above, in the present invention, in the blow molding in-mold label supply device for in-mold labeling for performing labeling at the same time as blow molding, the label in the label holder is directly attached. Blow-molding dies because it is a means to take out the label from the label end by a label take-out suction cup that rotates in synchronization with the label holder, instead of sucking it in the die supply head and pulling it out in the direction perpendicular to the label suction surface. It is possible to provide a device that surely supplies the labels one by one to the inside and does not generate label loss or defective molding (two pieces are stuck).

[Brief description of drawings]

FIG. 1 is a plan view showing a label supply device in a blow molding die according to an embodiment of the present invention, and FIGS. 2, 3, 4, 5 and 6 are plan views showing operating states of respective parts. Is. A …… Label 1 …… Label holder 15 …… Gear 2 …… Label take-out suction plate 21 …… Suction surface 22 …… Intake hole 25 …… Gear 3 …… In-mold supply head 31 …… Air cylinder 32 …… Suction head 33 …… Suction surface 34 …… Suction hole 4 …… Air cylinder 5,5 ′ …… Guide shaft 6,6 ′ …… Blow molding die

Claims (2)

[Claims] 1. A label in a blow molding die for in-mold labeling for supplying a label taken out from a label holder to an inner surface of a cavity of a blow molding die and simultaneously applying a label to a surface of a synthetic resin molded article at the same time as the blow molding. It is a supply device that can move forward and backward with a label holder, and when advancing between the blow molds in the open state at the time of forward movement, advances the label suction part toward the inner surface of the cavity of the blow mold. A label supply head inside the mold for supplying a label to the inner surface of the cavity, wherein a label take-out suction cup is provided between the label supply head inside the mold and the label holder, The take-out suction cup and the label holder can rotate at the same peripheral speed, and both of them rotate so that the label take-out suction cup can be rotated. The label holder adsorbs the label when the contact surface comes into contact with the outermost label surface in the label holder, and the label that is adsorbed when the suction surface separates from the label holder with the rotation of both. The label suction portion of the in-mold label supply head is disposed at a position different from the label holder so that the label suction portion of the label supply head can come into contact with the suction surface of the label pickup suction plate. The blow-mold in-mold label supply device is characterized in that 2. The label suction unit of the in-mold label supply head comes into contact with the suction face of the label take-out suction plate when the label suction unit is in the forward position. The label supply device in the blow molding die according to the item.